Nozzle for spraying cementitious materials



May 21, I957 w. e. BRowN ETAL 2,793,080

NOZZLE FOR SPRAY INC CEMENTITIOUS MATERIALS Original.Filed March 19,1949 370 35 370 360 364 INVENTORX ATTORNEYS NOZZLE FOR SPRAYINGCEMENTITIOUS MATERIALS Warren G. Brown and Warren D. Brown, Detroit,Mich.

2 Claims. (Cl. 299-134) The present application is a divisionalapplication of our copending application for patent, Serial No. 82,404,filed March 19; 1949, now United States Letters Patent No. 2,603,462,granted July 15, 1952, said application being a continuation-in-part ofour application, Serial No. 514,042, filed December 13, 1943, which wasabandoned March 30, 1949.

The present invention relates to an improved apparatus for preparing andspraying ceme'ntitiousmaterials suitable both for the weatherproofing,waterproofing and restoration of existing masonry and for theconstruction of new concrete structures.

Another object of the invention is to provide an apparatus of the typeindicated above, including a spray gun having an improved adjustablenozzle which is simple in design, economical of construction andreliable and efficient in operation.

A further object of the invention is to provide an apparatus of the typeindicated above, including an improved nozzle adapted to receive andspray a thick mixture of liquid and solid materials.

Other objects of the invention will become apparent from the followingspecifications, from the drawings relating thereto, and from the claimshereinafter set forth.

For a better understanding of the invention, reference may be had to thedrawings wherein:

Figure 1 is an elevational view showing a nozzle constructed accordingto the present invention mounted on an associated hose; and,

Figure 2 is a broken and enlarged sectional view of the apparatusillustrated in Figure 1, taken substantially along the line 2-2 thereof.

Referring to the drawing, the spray gun nozzle 338 comprises a body 344externally threaded at its outer end and internally threaded at itsinner end and mounted on the outer end of the spray gun 328 by anannular element 346 externally threaded for engagement with the threadedinner end of the nozzle body 344. The annular element 346 encircles theouter end portion of a metal reinforcing tube 348 housing the flexiblevalve sleeve element 350, through which the cement grout is supplied andcooperates with the reinforcing tube 348 to define an annular airchamber 352. The air line 340 is connected at its outer end to theelement 346 and communicates with the chamber 352. A circle nozzle plate354 carried in the nozzle body 344 fits over the outer end of the rubbersleeve 350, which in the construction illustrated terminates in anoutwardly turned flange portion 356 having a plurality of axiallyextending apertures 358 communicating with the annular air chamber 352.The nozzle plate 354 has an inwardly projecting central portion 360which fits Within the rubber sleeve 350 and defines a conical centralopening 362 therethrough. The outer marginal portion of the nozzle plate354 is provided with a plurality of equally angularly spaced radiallyinwardly inclined openings 364 registering at one end with the openings358, and each adapted to direct a jet of air from States Patent2,793,080 Patented May 21, 1957' the air chamber 352 at a predeterminedpoint on the axis on the nozzle body 344 axially outwardly of the plate354.

The nozzle body 344 also carries a flexible annular rubber element 366and an annular orifice controlling? member 368 internally threaded forengagement with the: externally threaded outer end portion of the nozzlebody 344. The member 368 may be moved axially of the nozzle body 344 bymeans of its threaded engagement with the nozzle body, and upon suchaxial movement relative to the nozzle body is effective, as hereinafterdescribed, to vary the size of the orifice definedby the flexibleelement 366. At its inner end, the flexible element 366 has an outwardlyextending annular flange 370- gripped between a cooperating. shoulder onthe nozzle body 344 andan outer'marginalportion of the inner face" ofthe nozzle plate 354, outwardly of the openings 364. Spaced inwardlyfrom its outer end the body 344 has an annular inwardly extendingprojection defining an outwardly presenting annular shoulder 372.

The flexible orifice element 366, in its: free or undistorted condition,has an inner cylindrical surface 374 defining the desiredimaximumorifice opening and extending from a point axially inwardly of theshoulder 372 to the outer end of the element 366. The radially outer surface of the element 366 is shaped toprovide an annular radiallyoutwardly extending projection 376 adapted to engage the shoulder 372, asealing flange portion 378 at the outer end of the element 366, and anintermediate radially outwardly extending annular portion 380 which,upon compression axially, cooperates in varying the size of the orificedefined by the element 366. In the normal or free condition of theelement 366, the sealing flange 378 extends radially and axiallyoutwardly. Upon assembly of the nozzle 338, the flange 378 is engaged byan annular element 382 carried by the member 368 and deformed to theposition illustrated in Fig. 9 in which it provides a seal preventingthe cementitious material from getting into the space between theelement 366, the member 368 and nozzle body 344. The element 382 has aninclined inner surface 384 cooperating with the shoulder 372 uponmovement of the member 368 axially inwardly to deform the inner surfaceof the element 366 to some position such as that illustrated in brokenlines in Figure 2, thereby reducing the orifice size. The element 382 isadapted to move into the outer end of the nozzle body 344 upon movementof the member 368 axially inwardly from the position of maximum orificeopening illustrated in Fig. 2. Also, the annular element 382 has anaxially inwardly extending flange 386 at its radially outer edge whichpresses the outer portion of the projection 380 into the outer end ofthe nozzle body 344 and cooperates in deforming the element 366 radiallyinwardly.

It will be appreciated that any suitable airline system may be providedfor supplying the desired air pressures to the line 330 leading to thespray gun 328. As an instance of a satisfactory pressure in the line 330for operating the spray gun 328 for the spraying of cement grout, it hasbeen found that a pressure of 60 pounds per square inch in the line 330gives good results.

While only one specific embodiment of the invention has been illustratedand described in detail, it will be readily appreciated by those skilledin the art that various modifications and changes may be made withoutdeparting from the spirit of the present invention.

What is claimed is:

1. An adjustable nozzle comprising a body having an openingtherethrough, a flexible member mounted in said opening and having adischarge passage therethrough, an operating member mounted on said bodyfor movement axially of said passage between a first and a secondposition, the minimum cross-sectional area of said passage being apredetermined desired maximum when said operating member is in saidfirst position, and means effective upon movement of said operatingmember to said second position to reduce the minimum cross-sectionalarea of said passage to a predetermined desired minimum, said flexiblemember in its free condition having a radially inner wall portionadjacent its axially outer end defining a passage portion ofsubstantially uniform cross-sectional area and a radially outer surfaceincluding a conical flange extending axially and radially outwardly fromthe outer end of said flexible member and adapted to be deformed axiallyinwardly during assembly of said nozzle to provide an annular sealbetween said flexible member and said operating member.

2. An adjustable nozzle comprising a body having an openingtherethrough, a flexible member mounted in said opening, said flexiblemember having a discharge passage therethrough, an operating membermounted on said body for movement axially of said passage between afirst position and a second position, the minimum cross-sectional areaof said passage being a predetermined desired maximum when saidoperating member is in said first position and means including anannular element engaging said operating member and eflective uponmovement of said operating member to said second position to reduce theminimum cross-sectional area of said passage to a predetermined desiredminimum, said flexible member having an outer surface portion engagingsaid body to limit radially outwardly movement of said surface portionof said flexible member when said operating member is in said firstposition, said flexible member having an annular radially outwardlyextending projection, said flexible member also having a conical flangewhich in its free condition normally extends axially and radiallyoutwardly from the outer end of said flexible member, said annularmember when in assembled relation with said operating member engagingsaid conical flange and deforming it axially inwardly to provide anannular seal between said flexible member and said operating member andengaging said projection during movement of said operating member fromsaid first position to said second position to deform said projectionand deform said flexible member to efiect said reduction of the minimumcross-sectional area of said passage.

References Cited in the file of this patent UNITED STATES PATENTS208,330 Palmer Sept. 24, 1878 221,349 Palmer Nov. 4, 1879 1,657,663Devereux Jan. 31, 1928 2,437,042 Prosser et a1. Mar. 2, 1948 2,543,517Anderson Feb. 27, 1951 2,564,896 Gustafsson Aug. 21, 1951 2,577,664 ProDec. 4, 1951 2,671,692 Matirko Mar. 9, 1954 FOREIGN PATENTS 11,067Netherlands May 15, 1924

